Costigan

• Christopher Costigan, explorer of the Jordan River and Dead Sea in 1835
• Daniel Costigan, former Commissioner of An Garda Síochána
• Edward P. Costigan, US senator from Colorado
• Francis Costigan, early Indiana architect
• Frank Costigan, Australian QC and commissioner in the Royal Commission on the activities of the Federated Ship Painters and Dockers Union
• Giovanni Costigan, historian
• George Costigan, a British television actor
• Howard Costigan, American political functionary
• James Costigan, screenwriter
• Jason Costigan, Australian Liberal National politician and former rugby commentator
• John Edward Costigan, American artist
• John Costigan
• Keith Costigan, former soccer player, and television sports analyst
• Kyle Costigan, American Football Player, Strength and Conditioning Coach for the University of Wisconsin-Madison
• Mabel Cory Costigan, on the advisory council of the National Child Labor Committee and vice president of the National Consumers League.
• Michael Costigan
• Michael Costigan
• Michael Costigan
• Neville Costigan, Australian rugby league footballer
• Peter Costigan,, Australian journalist, former Lord Mayor of Melbourne
• Sandra Costigan, former field hockey player

• Billy Costigan, a character in the Martin Scorsese film, The Departed, played by Leonardo DiCaprio
• Captain Costigan, a character in the novel Pendennis, by William Makepeace Thackeray.
• Sailor Steve Costigan, a character created by Robert E. Howard
• Conway Costigan, a character in E.E. Smith's Triplanetary
• Jerry, Grace and Russell Costigan, characters in Robert B. Parker's novel "A Catskill Eagle"